Howard campbell



(MMM) H. CAMPBELL.

FLASH LAMP.

No. 485,884. Patented Sept. Z, 1890.

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NITED STATES PATENT OFFICE.

HOXVARD CAMPBELL, OF BROOKLYN, ASSIGNOR TO THE PI'IYSICIANS SUPPLY MANUFACTURING COMPANY, OF NEV YORK, N. Y.

LAMP.

SPECIFICATION forming part of Letters Patent No. 435,884, dated September 2, 1890.

Applioatipn led February 19, 1890Y Serial No. 341,021. (No model.)

To all whom it may concern..-

Be it known that I, HOWARD CAMPBELL, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Flash-Lamp,of which the following is a specification.

The object of my invention is to provide an apparatus for producing from magnesium or 1o other suitable powdered material flashes of light the intensity and duration of which can be exactly regulated, from an instantaneous flash to a continuous light ofpoweriul brilliancy.

My invention consists in combining the parts hereinafter described so as to forni an apparatus for producing the above results.

The drawing represents a central vertical section of my apparatus and its generalforin.

A is a disk of metal.

B is a perpendicular hollow tube forming a powder-receptacle.

O is a stopper Iitted into the top of receptacle.

D is an air-induction tube having an airvalve E.

C is an ej ector-tube, through which the powder passes to the fiance-box.

G is a reflector-holder, and H an armature 3o for holding the Haine-box.

I is a centrally-perforated flame-box snpport-ed on the armature and filled with an aleolici-absorbent.

.I is a metal disk placed above the flamebox for spreading theiiarne and intensifying the heat.

K is a rubber tube connecting (by the induction-tube) the powder-receptacle with a thin rubber iniiatable bulb L, surrounded by 4o net-work.

M is a small hand-compressibleairbulb for iniiating the large bulb.

N is a tube-compressor for checking and regulating the iow of air.

In operating the apparatus the powderreceptacle B is charged with powder, the alcohol-lamp I lighted, the large bulb L inflated by compressing the smaller bulb M. lVh en the tube-conipressorN is opened the air rushes into the powder-receptacle B through 5o the airvalve E. and mixing with the powder carries it out through the ejector-tube C at F over the flame-box I. By compressing the tube K the iiow of air is entirely or partially shut olf, instantly extinguishing or reducing the light at pleasure. By keeping the elastic or reservoir bulb L inflated and t-he tubecompressor N open, a continuous and even light will be produced as long as there is any powder in the receptacle, which can be of 6o any size.

A continuous light might be produced by attaching a double bellows or an air-compressor to the tube K, without departing from my invention; but the double bulbs L and M are preferable.

Having thus described iny invention, what I claim as new, and desire to secure by Letters Patent, is-

l. A magnesium iiaslrlanip having a pow- 7o der-receptacleV formed in the standard of the lamp closed atY t-he top with a stopper, through which run parallel tubes, one supporting a flame-box and the other containing an airvalve, and connected by tubing with a double bulb or other air-compress n', substantially as described.

2. The combination, in dash-lamps, of a relectonholder on the ejectontube, a disk ot metal placed over a cenwally-perforated 8o flame-box for spreading the Haine, and an instantaneous shut-oit for stopping or reducing the flow of air into the powder-receptacle, substantially as set forth.

Signedat the eityof New York, in the county of NewYork and State of New York.

HOWARD CAMPBELL.

Witnesses:

SAMUEL CAMPBELL, AnoLPHUs D. PAPE. 

